[glib/wip/otte/liststore-properties: 1/3] liststore: Add "n-items" property

[Benjamin Otte <otte src gnome org>]

commit 6b62d63d36a107a7465c4f578ba2892b4747fa87
Author: Benjamin Otte <otte redhat com>
Date:   Wed Jun 8 18:19:01 2022 +0200

    liststore: Add "n-items" property

 gio/gliststore.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)
---
diff --git a/gio/gliststore.c b/gio/gliststore.c
index 555b4f310f..e7dbbd38fe 100644
--- a/gio/gliststore.c
+++ b/gio/gliststore.c
@@ -64,6 +64,7 @@ enum
 {
   PROP_0,
   PROP_ITEM_TYPE,
+  PROP_N_ITEMS,
   N_PROPERTIES
 };
 
@@ -89,6 +90,8 @@ g_list_store_items_changed (GListStore *store,
     }
 
   g_list_model_items_changed (G_LIST_MODEL (store), position, removed, added);
+  if (removed != added)
+    g_object_notify_by_pspec (G_OBJECT (store), properties[PROP_N_ITEMS]);
 }
 
 static void
@@ -115,6 +118,10 @@ g_list_store_get_property (GObject    *object,
       g_value_set_gtype (value, store->item_type);
       break;
 
+    case PROP_N_ITEMS:
+      g_value_set_uint (value, g_sequence_get_length (store->items));
+      break;
+
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
     }
@@ -157,10 +164,21 @@ g_list_store_class_init (GListStoreClass *klass)
    *
    * Since: 2.44
    **/
-  properties[PROP_ITEM_TYPE] = 
+  properties[PROP_ITEM_TYPE] =
     g_param_spec_gtype ("item-type", "", "", G_TYPE_OBJECT,
                         G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
 
+  /**
+   * GListStore:n-items:
+   *
+   * The number of items contained in this list store.
+   *
+   * Since: 2.74
+   **/
+  properties[PROP_N_ITEMS] =
+    g_param_spec_uint ("n-items", "", "", 0, G_MAXUINT, 0,
+                       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
   g_object_class_install_properties (object_class, N_PROPERTIES, properties);
 }